haskell: 13 new program suites + scoreboard 156/156 (775 tests)

collatz, palindrome, maybe, fizzbuzz, anagram, roman, binary, either,
primes, zipwith, matrix, wordcount, powers — all 18/18 programs green.
conformance.sh PROGRAMS array updated; scoreboard.md regenerated.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/haskell/scoreboard.md

@@ -1,6 +1,6 @@
 # Haskell-on-SX Scoreboard
 
-Updated 2026-04-25 · Phase 3 (laziness + classic programs)
+Updated 2026-05-06 · Phase 6 (prelude extras + 18 programs)
 
 | Program | Tests | Status |
 |---------|-------|--------|
@@ -9,4 +9,17 @@ Updated 2026-04-25 · Phase 3 (laziness + classic programs)
 | quicksort.hs | 5/5 | ✓ |
 | nqueens.hs | 2/2 | ✓ |
 | calculator.hs | 5/5 | ✓ |
-| **Total** | **16/16** | **5/5 programs** |
+| collatz.hs | 11/11 | ✓ |
+| palindrome.hs | 8/8 | ✓ |
+| maybe.hs | 12/12 | ✓ |
+| fizzbuzz.hs | 12/12 | ✓ |
+| anagram.hs | 9/9 | ✓ |
+| roman.hs | 14/14 | ✓ |
+| binary.hs | 12/12 | ✓ |
+| either.hs | 12/12 | ✓ |
+| primes.hs | 12/12 | ✓ |
+| zipwith.hs | 9/9 | ✓ |
+| matrix.hs | 8/8 | ✓ |
+| wordcount.hs | 7/7 | ✓ |
+| powers.hs | 14/14 | ✓ |
+| **Total** | **156/156** | **18/18 programs** |